Alpine cda 7995 no output

amc32 · 1st April 2009, 09:33 PM

I'm not into repairing head-units,but it just seem like a waste to just throw this radio in the trash. Looks like it came from salvage-yard with all the highlighted yellow markings on it.

I already know that there are no speaker level outputs.

I have confirmed with my O-Scope that the Front,Rear,Sub RCA output are not working.

Inside there appears to be some sort of "TDA" something,something audio amp chip mounted to an internal heatsink....

All other functions of the radio appear to be OK.....

Any sort of direction would be helpfull

Perry Babin · 1st April 2009, 10:13 PM

The 7995 doesn't have speaker level outputs (according to the owner's manual). The IC could be a regulator.

Follow the RCA signal lines back. It's likely to go to either an electronic volume control IC or an op-amp. Confirm that the IC has power supply voltage on it's power input terminals.

amc32 · 2nd April 2009, 12:15 PM

I think i've found out what the problem is. It appears that the external power supply has been removed. Either by a heavy-handed theif or salvage yard worker.

The external power supply is a plug and play unit. The complete wire harness was wanked from the board luckily no damage was done to the unit...

Does anyone have a idea where i can get a replacment.... PAC Parts?

Perry Babin · 2nd April 2009, 03:32 PM

The DC-DC converter isn't available according to PacParts.

http://www.pacparts.com/model.cfm?mf...TOKEN=15445953

amc32 · 8th April 2009, 03:26 AM

Since the external power supply is no longer available. Is there a service manual available so that I may build the power supply.

Does anyone know what other Alpine models used this same external power supplies so that I may find one and use it for parts.

I Am An Idiot · 8th April 2009, 08:49 AM

I may have a junked unit. I will check.

amc32 · 9th April 2009, 03:16 AM

THANKS

I Am An Idiot · 9th April 2009, 03:34 AM

I forgot to look today.

I Am An Idiot · 9th April 2009, 11:54 PM

I do have a 7998. It is the din and a half face unit in a din chassis. If you do the footwork to find out if they use the same power suppy. Let me know what you find out.

amc32 · 10th April 2009, 12:52 AM

THAT WILL WORK! MY EMAIL IS ABU.ZAFIRAH@YAHOO.COM LET ME KNOW THE COST.

1st April 2009, 09:33 PM	#1
amc32 diyAudio Member Join Date: Mar 2008	Alpine cda 7995 no output I'm not into repairing head-units,but it just seem like a waste to just throw this radio in the trash. Looks like it came from salvage-yard with all the highlighted yellow markings on it. I already know that there are no speaker level outputs. I have confirmed with my O-Scope that the Front,Rear,Sub RCA output are not working. Inside there appears to be some sort of "TDA" something,something audio amp chip mounted to an internal heatsink.... All other functions of the radio appear to be OK..... Any sort of direction would be helpfull __________________ ...............I Hear in color.................

1st April 2009, 10:13 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The 7995 doesn't have speaker level outputs (according to the owner's manual). The IC could be a regulator. Follow the RCA signal lines back. It's likely to go to either an electronic volume control IC or an op-amp. Confirm that the IC has power supply voltage on it's power input terminals. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

2nd April 2009, 12:15 PM	#3
amc32 diyAudio Member Join Date: Mar 2008	I think i've found out what the problem is. It appears that the external power supply has been removed. Either by a heavy-handed theif or salvage yard worker. The external power supply is a plug and play unit. The complete wire harness was wanked from the board luckily no damage was done to the unit... Does anyone have a idea where i can get a replacment.... PAC Parts? __________________ ...............I Hear in color.................

2nd April 2009, 03:32 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The DC-DC converter isn't available according to PacParts. http://www.pacparts.com/model.cfm?mf...TOKEN=15445953 __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

8th April 2009, 03:26 AM	#5
amc32 diyAudio Member Join Date: Mar 2008	Since the external power supply is no longer available. Is there a service manual available so that I may build the power supply. Does anyone know what other Alpine models used this same external power supplies so that I may find one and use it for parts. __________________ ...............I Hear in color.................


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8th April 2009, 08:49 AM	#6
I Am An Idiot diyAudio Member Join Date: Mar 2007	I may have a junked unit. I will check. __________________ If it ain't broke Don't fix it

9th April 2009, 03:16 AM	#7
amc32 diyAudio Member Join Date: Mar 2008	THANKS __________________ ...............I Hear in color.................

9th April 2009, 03:34 AM	#8
I Am An Idiot diyAudio Member Join Date: Mar 2007	I forgot to look today. __________________ If it ain't broke Don't fix it

9th April 2009, 11:54 PM	#9
I Am An Idiot diyAudio Member Join Date: Mar 2007	I do have a 7998. It is the din and a half face unit in a din chassis. If you do the footwork to find out if they use the same power suppy. Let me know what you find out. __________________ If it ain't broke Don't fix it

10th April 2009, 12:52 AM	#10
amc32 diyAudio Member Join Date: Mar 2008	THAT WILL WORK! MY EMAIL IS ABU.ZAFIRAH@YAHOO.COM LET ME KNOW THE COST. __________________ ...............I Hear in color.................

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